Ophthalmic mounting.



H. K. PARSONS OPHTHALMIC MOUNTING.v

APPLICATION FILED OCT. I6. 19!].

1,290,330., Patented Jan. 7,1919.

INVE/VTDR HA IE'OL D K. PAESONS H YTORIVEKS rm'r mmma nmzs cu, rnunk uyna, wumunmn, a c

onto HAROLD K. rnnsoivs, OESOUTHBRIDGE, massaonusnrrs.

ornrnnmuro MOUNTING.

To all whom itmay concern: y r r Be it known thatI, Hnnono K. Persons, a

citizen of the United States, residing at 7 Southbridge, in the county of Worcester and State of Massachusetts, haveinvented certain newfand useful Improvements in Oph thalmic Mountings, of which thefollowing is a specification;

l reference to structures of what are known This invention relates to improvements in fingerpiece mountings and has particular as the fingerpiece type, making use of spring actuated guard levers for retaining the mounting in position on the face of the wearer.

Theprincipal object of the present inventured at the present time. i

duced to a minimum,and in which the several working parts will be protected to a great degree againstdirt or the like andthe j mounting itself will bemuch easier to keep proved construction should be readily ap in a neat condition than is possible with present commerc al constructions.

Other objects and advantages of my imparent by reference to the following specification takenin connection with the accompanying drawings, and it will be understood thatI may make any modifications in the v specific details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of my invention.

' Figure 1 represents a front view of a mounting constructed in accordance with.

I and embodying my invention.

Fig. II represents a vertical sectional view of one embodiment of my invention;

fication thereof.

the mounting bearingat its ends the clips 2 In the drawings, the numeral 1 designates thebridge or supportingmember of for retaining in position the lenses 3.

In the form of my inventionparticularly illustrated in Fig. II, I have shown as rising from the support 1 the pivot screw 4 having mounted thereon the lower friction washer Specification oi? Letters Patent,

Patented an; *2, 1919.

1 Application filed. October 16, 1917. Serial No. 196,800;

or disk and the up er loose cylinder 6 of larger diameter than the member 5 the head of the screw serving to retain theseparts in position, a shoulder Son the screw engagmg the bridge to limit its downward movement and prevent any binding of the parts 5 and 6. Pivotally mounted onthe support 1 aroundthem'emberfi is the guard arm or tingerpiece lever9,the member 5 thus servmg as an anti-friction roller or bearing between the fixed post andthe movable lever, loose asrespects both ofsaid parts, whereby it friction between the parts: is eliminated, and the loose member moving partially with one and partially with the other will prevent any stlcking tending to loosen the pivotitself, tion is to eliminate to the largest possible" degree wear and friction interfering with ease of operation of mountings as manufac- 20 andwill allowof a greater freedom of movement'of the fingerpiece lever Qtlian is possible when this lever bears directly against the fixed memberon the support.

A further object of the present invention is the provision of an extremely neat appearing mounting in which friction will be re- Ithas been previously mentioned that the member 6 is of larger diameter than the member 5, and the purpose of this should be apparent by reference to Fig. II, in which it will be seen that the member 6 engages the inner portion of theleveri9 serving to limit the upward movement of the lever, although being suff ciently short to allow of slight verticalplay of thelever and thus prevent any binding between the lever and the member 6. The cyllnder being loosely mounted on the pivot screw may also turn with either the leveror with agripping coil of the enc rcling spring as the fingerpiece lever is actuated, thus relieving the pivot of any gripping action of the spring and relieving the lever from the presenceof a fixed or immovable member bearing against its upper face tendmg to interterewith the proper easy movement of the lever. In Fig. III, I have shown a further modificationof my invention, in which I employ a central tube or post 10 passing downward through thebridge and secured in position as by the screw llfsaidpost having a shoulder at'12 to limit its movement downward onto the bridge, and having an enlarged upper end, as at serving as a head limit upward movement/of the series of antifriction rings or washers 14 which are mountedon the post. The lower of said washers is adapted to readily move with or form a bearing for the pivoted lever 9, while the upper washers fit within the coils of the spring15, whereby as the lever is actuated 1f any one coil tightens up in advance of the llO others and normally has'a tendency to bind members and cause'those members'to turn' with the spring so that the spring action is communicatedxto both the upper and lower coils if it be an intermediate coil which first grips, as is frequentlythe case in a spring of this nature, the lower. coil becomes tightenedbefore. much springaction'occurs in the V outer coils.

. This spring action is a difliculty which is frequently met :with in connection with mountings employing a spring of this nature as there may be a tendency of the spring to :grip ata particular point, as at the bottom, ormore often at two points, as at'the bottomandtop, on account; of the bends and adjustments that may have been made at these points in .fitting the spring to the mounting, and it is one of the essential purposes of my invention to getaway from this difficulty by providing the plurality of loose washer members on the central post sothat no matter if the'spring grips at one or more points, these members having independent movement as respects-each other may readily move with th'espringcoils and automatically adjust themselves so that the spring action occurs substantially throughout the -.entire.length of the spring and maximum efficiency as well as maximum durability and wear of the spring is accomplished.

In the form of my invention now under "consideration I preferably simply slip the lever down'over the post and washers and -to retain it in position 'may make use of the inclosing cylinder or barrel member 16,

"which is of size to just fit around and inclose the coils or working portion of the "spring 15, and is retained in position as by the cap plate 17 fitted on top of the post and there secured by the screw. 18, pins 19 serving to lock the cap plate'against loosening.

It will be notedbyreference to the drawings that the member lti has the slot '20 through'which the end of the spring extends to the mounting, an'd it is of suflicient height to-normally provide a slight clearance between i-tand th'ecap plate 17 so that there is 'normally no friction on account of this steadying of the lever, but. should the lever ride uprslightly ortend' to tip, the steady ing barrel 16 will then engage the lever on the one sideand the cap plate on'the other and prevent tipping or weaving of'the lever,

' while the barrel 16. being loose may either 'remains'tationarywith the cap plate or slide with :the lever but to less extent than the v movement of the-lever, and thus minimize the frictional resistance to the swinging of the exception that the post is rigidly secured, as by soldering, to the bridge or support 1, and the cap plate 17 is provided with to each other so that the movement on rotation of the lever may be either a sliding ,movement between the two halves of the spring inclosing barrel, each half remaining with the part against which it bears on its outer end, or may be a movement of the barrel as an entirety, or any combination of the parts, the provision of the several relatively loose slidingly mounted parts attaining a minimum of friction, while at the same time the parts as shown entirely inclose the spring and other moving parts of the mounting, presenting the neatest possible appearance with the fewest surfaces and inequalities to gather dirt, thus rendering themounting much easier to keep ina neat and cleanly condition than is the ordinary mounting with the spring coils and other parts liable to collect such dirt.

- I claim:

1. In an ophthalmic mounting, the combination with a support, of a pivot rising therefrom, a lever, an actuating spring for the lever mounted around the post and separate and distinct anti-frictional devices interposed between the lever and the pivot and between the spring and the pivot.

2. In a device of the character described, the combination with a-support, of a post rising fromthe support, a plurality of antifrictional devices carried by the post, and a lever and an actuating spring therefor unent of the lever with respect to the post.

4. A device of the character described, includinga support, a post rising from the support,anti-frictional devices mounted on the post, a lever and an actuating spring therefor mounted on said anti-frictional devices, and a detachable cap :on the post for securing the parts in position.

' 5. A device of the character described, including a support, a post rising therefrom,

anti-frictional devices carried by the post, a lever having a portion encircling the post, a spring encircling the post for actuating the lever, said anti-frictional devices holding said parts in spaced relation to the post, a barrel resting on the lever and of size to inclose the spring and post, and means on the post for retaining the several parts in position, whereby the barrel serves to con- 10 ceal the spring and post and serves as an anti-friction device limiting upward or Weaving movement of the lever as respects the support.

In testimony whereof I have aflixed my signature, in presence of two Witnesses.

HAROLD K. PARSONS.

Witnesses:

H. E. COLEMAN, E. M. HALVORSEN.

Copies of this patent may be obtained for five cents each, by addressing the "Oommmioner of Patents, Wuhington, D. 0. 

